[clang] Remove experimental from Vector Crypto extensions (PR #69000)

[Brandon Wu via cfe-commits]

4vtomat wrote:

> Thanks for the patch, some very quick feedback and I'd highlight the first bullet as the most important, as this is potentially a blocker for graduating these extensions from experimental.
> 
> * My big concern with this would be the intrinsics - could you please comment on the status of their standardisation?
> * While doing this change, it would make sense to update the header of RISCVInstrInfoZvk.td. While it doesn't explicitly say it describes an experimental version of the extension, it references 1.0.0-rc1 of the spec while presumably there's now a 1.0.0-final?
> * Please update llvm/docs/RISCVUsage.rst
> * Please add a release note to llvm/docs/ReleaseNotes.rst

Currently I guess we're not finalized yet in https://github.com/riscv-non-isa/rvv-intrinsic-doc/pull/234.

> 
> Edit: When committing after review, the commit should be titled something like "[RISCV] Remove experimental from vector crypto extensions".

Oh, thanks, I forgot it~

https://github.com/llvm/llvm-project/pull/69000